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Simple circular graph to enhance a number (HTML, CSS and SVG)

Logo CSS 3 CSS 3
Logo HTML 5 HTML 5
Logo SQL SQL

By ,
Piblished the April 23, 2020

I looked for a way to enhance a number, a percentage or a rate. I had already seen these VG graph and I thought it was very complex. But it was also very efficient to visualise a rate.

Some JS library enables to make very complex graphs on the web. But here, I needed to find a very simple way to draw a graph with SVG. That’s why I decided to create a very simple circular path with SVG.

Mise en pratique sur codepen.

Code a circle with SVG

Normally, it is common to use a dedicated software to draw vectors (Like Illustrator). But here, we are going to write very simple SVG tags. I open a <svg> tag and I insert a new <path> tag. (I could have used this tag instead <circle>).

Here I draw a SVG circle :

<svg viewBox="0 0 36 36" class="circle-svg">
   <path class="around" 
      stroke-dasharray="100, 100"
      d="M18 2.0845 a 15.9155 15.9155 0 0 1 0 31.831 a 15.9155 15.9155 0 0 1 0 -31.831"></path>
</svg>

I choose the <path> tag here because it will enable me to create the arc of a circle. The attribute “stroke-dashaway” defines the outline of the circle. Here I want to draw a conuinue line to the end of the circle. So I write the maximum values (“100, 100”).

Note that  “stroke-dasharray” is a CSS value and we could have used it directly in the CSS.

Now I will create a second arc of circle in blue :

<svg viewBox="0 0 36 36" class="circle-svg">
   <path class="around" 
      stroke-dasharray="100, 100"
      d="M18 2.0845 a 15.9155 15.9155 0 0 1 0 31.831 a 15.9155 15.9155 0 0 1 0 -31.831"></path>
   <path class="percent" stroke-dasharray="30, 100" d="M18 2.0845 a 15.9155 15.9155 0 0 1 0 31.831 a 15.9155 15.9155 0 0 1 0 -31.831"></path>
   <text x="18" y="14" text-anchor="middle" dy="7" font-size="20">3/10</text>
</svg>

My second tag is similar to the first one, excerpt from this value stroke-dasharray, set to 30, 100. This is corresponding to a 30% arc. Be careful, this attribute is not corresponding to a percent value.

.circle-svg {
  display: block;
  margin: 10px auto;
  max-height: 100px;
}
.circle-svg text {
  text-align:center;
  color:black;
  font-size:10px
}
.circle-svg path.percent {
  stroke: #6f6fff;
  fill: none;
  stroke-width: 2.8;
  stroke-linecap: round;
  animation: progress 1s ease-out forwards;
}
.circle-svg path.around {
    stroke: #c4c4c4;
    fill: none;
    stroke-width: 2.8;
}

Now I am going to animate this arc with this rule in CSS :

@keyframes progress {
  0% {
    stroke-dasharray: 0 100; 
  }
}

 

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